Fixed form was traditionally used in older Fortran programs. The free form layout was introduced in Fortran 90. ffree-form -ffixed-form Specify the layout used by the source file. Options controlling Fortran dialect The following options control the details of the Fortran dialect accepted by the compiler: finit-local-zero -finit-integer= n -finit-real= -finit-logical= -finit-character= n -fno-align-commons Wno-align-commons Debugging Options -fdump-parse-tree -ffpe-trap= list -fdump-core -fbacktrace Directory Options -I dir -J dir -fintrinsic-modules-path dir Link Options -static-libgfortran Runtime Options -fconvert= conversion -fno-range-check -frecord-marker= length -fmax-subrecord-length= length -fsign-zero Code Generation Options -fno-automatic -ff2c -fno-underscoring -fsecond-underscore -fbounds-check -fcheck-array-temporaries -fmax-array-constructor = n -fmax-stack-var-size= n -fpack-derived -frepack-arrays -fshort-enums -fexternal-blas -fblas-matmul-limit= n -frecursive Wimplicit-interface -Wline-truncation -Wintrinsics-std -Wsurprising -Wno-tabs -Wunderflow -Wunused-parameter -Wintrinsics-shadow D macro -U macro -H -P Error and Warning Options -fmax-errors= n -fsyntax-only -pedantic -pedantic-errors -Wall -Waliasing -Wampersand -Warray-bounds -Wcharacter-truncation -Wconversion
fdefault-double-8 -fdefault-integer-8 -fdefault-real-8 -fcray-pointer -fopenmp -fno-range-check -fbackslash -fmodule-private Preprocessing Options -cpp -dD -dI -dM -dN -dU -fworking-directory -imultilib dir -iprefix file -isysroot dir -iquote -isystem dir -nocpp -nostdinc -undef -A question = answer -A- question -C -CC fd-lines-as-comments -ffixed-line-length- n -ffixed-line-length-none -ffree-line-length- n -ffree-line-length-none Explanations are in the following sections.įortran Language Options -fall-intrinsics -ffree-form -fno-fixed-form -fdollar-ok -fimplicit-none -fmax-identifier-length -std= std -fd-lines-as-code Here is a summary of all the options specific to GNU Fortran, grouped by type. Two forms, whichever one is not the default. In some cases, options have positive and negative forms the negative form of -ffoo would be -fno-foo. The same time, such as g++), since adding GNU Fortran to the GCC distribution enables acceptance of GNUįortran options by all of the relevant drivers.
Only options specific to GNU Fortran are documentedĪll GCC and GNU Fortran options are accepted both by gfortran and by gcc (as well as any other drivers built at The gfortran command supports all the options supported by the gcc command. Only the most useful options are listed here see below for the remainder.
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